Deformation of the grid with the falloff
Falloffs in Animation Nodes are mostly hard-coded, that is, you need to write cython/python code to create a custom falloff. So it is much easier to compute the effect you are after manually. A simple implementation of grid deformation is as follows:



Want to transform it based on an empty? Simply subtract the location of the empty from the x and y of your equations:



Want to scale it? Similarly multiply the scale of the empty to the x and y of the equation.